08483947 is referenced by 1 patents and cites 22 patents.

A method of distributing map data from a map server to a wireless communications device entails generating a bitmap array representative of the vector map data for a given zoom level, computing attributes of the bitmap array to determine which map features to retain and which map features to suppress, and then transmitting to the wireless device only the map data for the map features to be retained. By counting the number of bitmap cells representing a polygonal map feature such as a park, lake, or island, the approximate area is quickly estimated. If the area falls below a threshold, the map data for the small polygon is discarded. Similarly, if a polyline map feature overlaps (or is too proximate to) another polyline map feature, one of the polyline map features is discarded. The map data actually transmitted is thus reduced, thereby economizing bandwidth without unduly sacrificing map detail.

Title
Bitmap array for optimally distributing map data content to wireless communications devices
Application Number
11/837172
Publication Number
8483947 (B2)
Application Date
August 10, 2007
Publication Date
July 9, 2013
Inventor
Xiaming Xi
Kanata
CA
Eric Johnson
Ottawa
CA
Agent
Gowling Lafleur Hendreson
Assignee
Research In Motion
CA
IPC
H04M 3/42
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